Nafasi water installs Grundfos pump in new lime slaker
PUMPS
A stainless steel Grundfos booster pump is at work in Nafasi Water’s recently commissioned lime-slaking facility in the Mpumalanga coal mining region. According to Nafasi Water chief strategy officer Ashton Drummond, the new facility serves an important mine water treatment plant in the area and will help the plant cut its operating costs. “Instead of transporting lime to site in its heavier form – as calcium hydroxide – we can now reduce delivery volumes by transporting calcium oxide and slaking it on site,” says Drummond. “The cost savings make for an attractive payback period for the investment in the lime-slaking reactor.” Raymond Makgoga, the associate sales engineer at Grundfos, says two Grundfos stainless steel end-suction pumps were supplied to the project – one for duty and one for standby.
mine-impacted water to a high level of quality, allowing it to be discharged back into the river system in compliance with environmental regulations. The quality of the water is, in fact, so good that it is also pumped to the local municipality as drinking water for the community. The company’s treatment plants apply its proprietary HiPRO™ technology (Hi recovery Precipitating Reverse Osmosis), allowing up to 99,5% water recovery from complex waters emanating from mining areas.
“The stainless steel is an important requirement due to the corrosive nature of the permeate being pumped into the lime slaker,” says Makgoga. “Our Grundfos NB/NK stainless steel end-suction pumps are excellent solutions for industrial applications, including where pumping of aggressive media is required.”
The relationship between Nafasi Water and Grundfos goes back many years, says Drummond, with its water treatment plants making extensive use of Grundfos pumps. He notes that Grundfos is exceptionally competitive when responding to market requests for pump packages. Its wide range of pumping solutions also allows Grundfos to offer technically compliant solutions that meet customer needs.
The installed pump delivers 50 m3 per hour at a pressure of about 4.5 bar. He notes that the pump’s efficiency has been enhanced by an IE3 WEG motor rated at 15 kW. The WEG motor was also able to accommodate the plant’s requirement for 525 V input. Nafasi Water’s plant treats
Grundfos South Africa (PTY) Ltd, +27 (0) 10 248 6000, info_za@grundfos.com, www.grundfos.com/za
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Water is the foundation of the Big Four Agenda The Big Four Agenda, announced by President Uhuru Kenyatta in late 2017, has four main pillars. Enhancing Manufacturing, Food Security and Nutrition, Universal Health Coverage and Affordable Housing.
WATER
Affordable housing implies the development of adequate, standardised, and well-spaced houses with a continuous supply of clean water and electricity. The supply of clean water continues to be a problem despite the unveiling of the government’s plans to implement a water storage programme. The plan has a strong focus on ensuring that informal settlements and arid areas also have access to clean water and is aimed at increasing the numbers by 20% or in plain terms, safe drinking water to over 9 million people by 2022. This goal does not appear to be achievable. With the government declaring a major hole in the funding budget, a more realistic timeline seems to be 2030. With an estimated growth rate of at least 2.6% per annum, the Kenya National Bureau of Statistics projects a population of around 53 million by the end of 2022, when the plan was due to have been completed. Kenya depends on natural resources and agriculture; therefore, the growing population will face considerable water scarcity pressures, including encroachment of marginal lands to cater for human settlement and
deforestation of the five ‘water towers’, the natural forests that are water catchment areas. And it doesn’t stop there. Data from the Ministry indicates that nearly half of the residents of Nairobi, which equates to over 2 million people, do not have direct access to clean water and must rely on kiosks, bowsers, and illegal connections. The suggested deficit is 125 million litres per day. However, according to a July 2020 report, published by the Athi Water Works Development Agency, the Nairobi water deficit is nearly three times the ministry figure at 304,000 cubic metres per day. This means that some Kenyans can go days without seeing a drop of water from their taps. In addition, the World Health Organisation issued an alert that most of the capital’s water is unfit for human consumption. It is worth noting that the country spends far too much of its budget repairing failing sewer systems and damaged water pipes. The materials that are used are outdated, cumbersome and prone to quick deterioration. Kenya should look to new technologies and systems that are available when building its water infrastructure. Materials that will add value and sustainability to the city and across the whole nation.
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To address the water scarcity issues, and bring hope, a strategic plan has been put in place for the construction of large and medium-sized dams, as well as investment in rainwater harvesting to finally save some of the surface water generated during rainy seasons. The Athi report shows that once the Northern Collector Tunnel in Murang'a County is completed, it will boost the water supply by 140,000 cubic metres per day. Another 23 million litres per day will be injected from the Karimenu II Dam in Kiambu County. Both these are due to be commissioned by the end of 2022. Ruiru II and Maragua Dams, which are due for completion by 2023 and 2026, respectively will also add to the capacity but their commissioning dates means Kenyans will still have to live with a water crisis for at least the next five years. There is an urgent need for a culture change. Employment of modern techniques and materials for the water industry may cost more initially, but their whole life value is unquestionable. Innovative and sustainable approaches will ensure that all Kenyans have access to clean water, that the Big Four Agenda is achievable and most importantly; facilitate the goal of safeguarding our most precious resource. Megapipes Solutions, +25 474 529 0318, sales@megapipes.com, www.megapipes.com
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